High tension insulator



June 9, 1942.

V. GROSSE 2,285,964 HIGH TENSION INSULATOR Filed Oct. 23, 1940 Figs.

' rrrwmrmfi Ifiventor: Vitaly Gros e, y 6? His Attorngg.

Patented June 9, 1942 HIGH TENSION IN SULATOR Vitaly Grosse,Berlin-Lichterfelde, Germany, assignor to General Electric Company,acorporation of New York Application October 23, 1940, Serial No. 362,437In Germany November 9, 1939 3 Claims.

The present invention relates to high tension insulators and especiallyto high tension insulators comprising flexible suspension means.

The object of the invention is to provide an improved construction andarrangement in a high tension insulator of the above type, and for aconsideration of what is believed to be novel and the invention,attention is directed to the following specification and the claimsappended thereto.

In the drawing, Fig. 1 is a side elevation of a high tension insulatorarrangement embodying the invention; Fig. 2 is a side view of theconstruction shown in Fig. 1; Fig. 3 is a perspective view of a furthermodification; Figs. 4 and 5 are detail views similar to Figs. 1 and 2 ofan arrangement similar to that shown in Figs. 1 and 2 wherein the glassropes are enclosed in protective casings; Fig. 6 is a view partly insection of a further modification; and Fig. 7 is a similar view of stillanother modification.

According to the invention, the insulator comprises a suspension memberformed of flexible glass fibers woven to form a glass strand, rope orthe like. of threads, bands or strings formed from individual glassfibers. Preferably, several parallel lengths of the glass rope or strandare utilized to form a suspension member.

Referring first to Figs. 1 and 2, I indicates an electrical conductor orcable mounted in a hanger 2. Hanger 2 is supported by a strain insulatorcomprising a plurality of glass ropes or strands 3, four being shown inthe present instance. The

ropes or strands extend around pulleys 4, the

large number of turns of strands or rope are wound over pulley memberscarried by suitable frames. In Fig. 3, 1 indicates a lower frame similarto frame 5 of Fig. 1 provided with two pulleys 8, and 9 indicates anupper frame similar to frame 6 provided with two pulleys l0. Wound rback and forth over the pulleys 8 and I0 is continuous glass rope orglass strands II. This arrangement is similar to that shown in Figs. 1and 2 except that a larger number of turns are utilized. This adapts theconstruction for carry- 3 The rope or strand may be made up ing heavierloads or for being formed from lighter strands or rope.

When used in closed rooms, such as switchboard rooms, for example, theglass rope or strands may be given a coating of lacquer or a coating ofa non-organic varnish having a base of colloidal clay to reduce thesettling of dust. For outdoor installation, however, it is preferable toprovide the glass rope or strands with a tubular protection to shieldthem from moisture and frost. For this purpose, a ceramic tube may beused, which tube may have a smooth surface or may be provided withcorrugations. In Figs. 4 and 5, glass strands or glass rope l2 extendaround pulleys l3 carried by a suitable metal head i4, head l4 beingprovided with an eye l5 by means of which it may be suspended.Surrounding the strands I2 is an insulating tube l6, such as a ceramictube, connected to head I4 by a yieldable member I! which may be in theform of a metallic bellows suitably attached at its ends to head HI andthe upper end of tube I 6. Only the upper end of the construction isshown in Figs. 4 and 5. The lower end may be of similar construction butarranged, of course, to carry a support for a line wire or cable. Withthis arrangement, the suspension insulator when used outdoors has itsstrands 12 protected from the atmosphere. At the same time, thearrangement permits the equalization of the load among the severalstrands as described in connection with Figs. 1 and 2.

In Fig. 6 is shown a modification wherein glass strands l8 are mountedin an insulating tube IS, the same being preferably compacted therein.In the upper ends of the strands I8, metal wires l8 are suitably wovenso as to be firmly connected thereto and such wires are fanned out asindicated at 20 to provide flanges for supporting the upper and lowerends of the insulator in heads 2| and 22. The parts [9 are curved asindicated at 23 so as to provide for a limited amount of yieldingaction. Thus yielding means are provided to connect the insulator properto the heads.

Fig. 7 illustrates a construction wherein the plurality of strands ofglass rope 24 are suitably connected to upper and lower heads 25 and 26,which heads in turn are connected to each other by an insulating tube 21of suitable material, such as a ceramic material. In this constructionthe arrangement may be such that normally the support is formed by thetube 21, the glass rope coming into play only should the tube be broken.

In the case of the construction shown in Figs. 4, 5 and 7, the hollowspace within the tubes may be filled with a solid or liquid filler. As aliquid filler, a suitable incombustible oil may be utilized. If a solidfiller is desired, a suitable waxlike substance which retains itsplasticity even at lower temperatures may be used. Also, a nonorganicpowder may be used to advantage. Such a powder may be a condensationurea resin powder which emits a gas so that in case of a flashover whichwould destroy the casing, the gas developed will protect the hightension insulator against the effects of arcing. Such a filling isindicated at 28.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. A high tension strain insulator comprising an insulating tube,strands formed from glass extending longitudinally of and compacted inthe bore of said tube to form a unitary strain insulator member,supporting heads, and axially yielding means connecting said member tosaid heads.

2. A high tension strain insulator comprising an insulating tube,strands formed from glass extending longitudinally of and compacted inthe bore of said tube, a supporting head, and metal wires interwovenwith said strands and yieldingly connecting said tube and strands tosaid head.

3. A high tension strain insulator comprising an insulating tube,strands formed from glass extending longitudinally of and compacted inthe bore of said tube, a flanged metal head, and curved metal wiresinterwoven with said strands and shaped to provide a flange whichengages the flanged metal head to yieldingly connect the tube andstrands to said head.

VITALY GROSSE.

